Self-belting pulley



(Model) J. E. DONOVAN.

zzaofznted hni 2, 1883.

SELF BBLTING PULLEY off N. PETERS. PYIOIDLRM UNIT D STATES PATENT OFFICE.

JOHN E. DONOVAN, OF CINCINNATI, OHIO.

SELF-BELTING PULLEY.-

SPECIFICATION forming partof Letters Patent No. 270,028, dated January 2, 1853.

Application filed July 6,1882. (Model.)

To all whom it may concern:

Be it known that I, JOHN E. DONOVAN,a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Self-Belting Pulleys, of which the following is a specification.

My invention relates to an improved selfbelting pulley, which will be fully explained in the description of the accompanying drawings, in which Figure 1 is an elevation of my improvement; Fig. 2, a top plan view, and Fig. 3 a plan view of the pulley before the bandgroove is scored. I

A represents the balance-wheel of an ordinary sewing-machine. r

B represents a grooved pulley in which the V band runs for driving the machine.

0 represents spider-arms of the fly-wheel; c, the crank-shaft.

D represents a grooved flange, which projects laterally on one side of the rim ofthe grooved wheel B a sufficient distance to allow of an angular groove, d, to he. formed in the flange D, of the same size and depth as the groove b in the band-wheel B. This angular groove dintersects the groove bin the manner terns are placed in the flasks so as to cast the wheel integral, and of the form shown in Fig. 3, when the groove is cut by being turned in a lathe in the usual manner. In other belting devices having a simplenotch cut in the rim of the grooved pulley the belt is required to be held by the hand to secure it, Whereas my device will automatically band the wheel by simply turning the wheel, the angular groove d catching and guiding the belt into place. By these means I also avoid strains of the belt by lifting it bodily over the flange of the grooves, and avoid the use of studs or fingers, which are made to project above the face of the flanges on either side of the groove,

which studsare liable to catch theclothing ot' the operator.

My device can be made at a very slight increase in cost over the common plain pulley,

and obviates theobjections existing in other JOHN E. DONOVAN.

Witnesses:

J NO. E. J ONES, .T. H. OHAs. SMITH 

